[BUG] Command selector highlights wrong command when filtering by partial name

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When using the / command selector to search for commands, typing a partial command name does not filter correctly. Specifically, when typing /model to find and run the /model command, the selector incorrectly keeps /modern-git highlighted instead of filtering to show /model as the active selection.

<img width="824" height="662" alt="Image" src="https://github.com/user-attachments/assets/d953e643-2234-4ab2-9b9a-4e28d305756f" />

The command selector appears to have a fuzzy matching or focus update issue where it matches commands containing the typed characters but fails to update the highlighted/active selection properly. This makes it impossible to select the intended command when multiple commands share partial name similarities.

What Should Happen?

The command selector should:

1. Filter the command list to show only commands matching the search term
2. Highlight the first matching result
3. Update the highlight when the search is refined further
4. Allow selection of the correct filtered command

Error Messages/Logs

No error messages shown, but the UI behavior is incorrect - the highlighting remains on /modern-git when the search text is /model.

Steps to Reproduce

1. Open Claude Code (any project/directory)
2. Press / to open the command selector
3. Type model (so the full input is /model)
4. Observe: The selector still shows /modern-git as highlighted instead of /model
5. Expected: /model should be highlighted as it matches the search term

Claude Model

Latest available (currently using Haiku 4.5)

Is this a regression?

Unknown - unclear if this worked in previous versions

Claude Code Version

Claude Code v2.1.12

Platform

GitHub CLI / Git workflow commands

Operating System

Windows

Terminal/Shell

Windows Terminal / PowerShell

Additional Information

This is a UI/UX issue with the command selector's filtering and focus logic. The bug manifests when:

• Multiple commands share similar prefixes (e.g., /model and /modern-git)
• User types a partial search that matches multiple commands
• The fuzzy search or highlighting system fails to properly prioritize the exact match

Screenshot: See attached - shows /model typed in the input but /modern-git remains highlighted below.